Slipper



FIG. 1 is a top plan view of a slipper, showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view, the right being a mirror image thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a slipper, as shown and described. 